ta63-1uzze Posted October 10, 2013 Share Posted October 10, 2013 so I understand that there is different offsets, and there meanings, but how do I turn raw data into an offset ? what I have is some measurements from the hub face on my car, but I am not sure how to apply these measurements into an offset. so far I have from the face of the hub I can go 100mm/4 inch's towards the strut " negative" from hub face, and from the hub face to the lip of my flares is 140mm/5.5 inch's "positive" . so does the offset represent a percentage or a physical measurement ie : would the offset be negative 40mm from the above measurements ??? Quote Link to comment Share on other sites More sharing options...
Bling Posted October 10, 2013 Share Posted October 10, 2013 Brief overview: http://www.tirerack.com/wheels/tech/techpage.jsp?techid=101 Calculator: http://www.1010tires.com/Tools/Wheel-Offset-Calculator Offset is measured in mm. In general, the more negative a wheel offset is, the further it will sit out from the mounting face towards the guard. Positive means wheel sits closer to the strut. 99% sure you are correct in that the wheel would be 9.5" with -40 offset. Someone will correct me if wrong. FWD tends to be +40 as more of the wheel is inside of the hub face. RWD is generally around +25 and lower. So something wide and with an offset of -20, is going to stick out quite far from the hub face. Whereas something +50 is going to fit closer to the strut. Which is why you often can't fit FWD to RWD cars as the offset means the wheel hits the strut. But you can physically fit RWD wheels to FWD vehicles, they just stick out past the guards. I went around in circles, but you should get the idea. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted October 10, 2013 Share Posted October 10, 2013 The offset is how far the hub face is from the centre of the wheel, so you can work it out by measuring from the hub face to the rear of the wheel and subtracting that from the total width of the wheel. Measuring bead to bead is fairly standard (rather than lip to lip) incase the lips are different widths. This might help? http://www.willtheyfit.com Quote Link to comment Share on other sites More sharing options...
xsspeed Posted October 10, 2013 Share Posted October 10, 2013 The offset is how far the hub face is from the centre of the wheel, so you can work it out by measuring from the hub face to the rear of the wheel and subtracting that from the total width of the wheel. Measuring bead to bead is fairly standard (rather than lip to lip) incase the lips are different widths. This might help? http://www.willtheyfit.com its half rim width minus backspace Quote Link to comment Share on other sites More sharing options...
Truenotch Posted October 10, 2013 Share Posted October 10, 2013 its half rim width minus backspace Hah, that's a much easier way to work it out. Quote Link to comment Share on other sites More sharing options...
xsspeed Posted October 10, 2013 Share Posted October 10, 2013 Actually if you want your +s and -s the right way round its backspace minus half rim width ie say wheel is 200mm wide and backspace is 95mm 95 -0.5(200) = -5 offset is -5 Quote Link to comment Share on other sites More sharing options...
ta63-1uzze Posted October 10, 2013 Author Share Posted October 10, 2013 Ah. Sweet I get it. Total width divide by 2 Then take that measurement and minus it from the backspace, that equals offset. Thanks boys, was as simple as that, just needed to be explained . . Thanks . I agree it should be sticky thread. I bet this is a very common question . I couldn't find any simple explanations last night and I was getting frustrated , calculators were no help as I don't have the correct wheels to measure in the first place. Quote Link to comment Share on other sites More sharing options...
sr1600 Posted October 10, 2013 Share Posted October 10, 2013 Always gets me as well So total overall width to work out the offset Inside lip measurement is the wheel width meaning the width of the lip has no relation #otherthanspitroast Ami Correct? Quote Link to comment Share on other sites More sharing options...
Truenotch Posted October 14, 2013 Share Posted October 14, 2013 If one lip is thicker than the other it'll throw the numbers out a bit, otherwise there's no relation. Quote Link to comment Share on other sites More sharing options...
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